DSL Receiver PLC Interference Probing via Sound Packet Detection
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Solution Overview
Problem
Digital subscriber line (DSL) systems experience interference from power line communication (PLC) signals, leading to impulse noise on twisted pair wires, which disrupts communications and requires effective measurement and mitigation techniques to enhance interoperability between DSL and PLC systems.
Innovation Solution
A DSL receiver detects impulse noise and identifies associated PLC sound packets, measuring PLC signal leakage based on these packets, and communicates this information to an arbiter to optimize transmission parameters and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PLC systems utilize electrical wiring within a building as network cables to carry communications, then network connectivity is improved, but electromagnetic interference is generated that disrupts DSL communications
Solution Approach 1:
The patent uses the PLC signals that cause interference as a beneficial probing mechanism. By detecting PLC sound packets on the DSL lines, the system can measure interference levels and use this information to optimize both PLC and DSL communications, converting the harmful interference into useful measurement data for mutual optimization.
Solution Approach 2:
The system implements feedback by measuring PLC signal leakage into DSL lines and using this information to adjust transmission parameters. The arbiter receives interference measurements and provides feedback to optimize PLC transmissions, creating a closed-loop system that continuously improves interoperability.
2Difficulty of detecting and measuring
If impulse noise measurement techniques are implemented to detect PLC interference, then interference detection capability is improved, but measurement accuracy is compromised by inability to distinguish sound packets from data traffic
Solution Approach 1:
The patent segments the PLC signal into distinct sound packets with identifiable characteristics (preamble, header, payload structures). This segmentation allows the system to distinguish sound packets from random impulse noise and from each other, enabling precise measurement of individual packet interference levels.
Solution Approach 2:
The system uses distinctive temporal and spectral signatures (analogous to color changes) to identify sound packets. By detecting specific patterns in the signal - such as the presence of a preamble and header - the system can reliably distinguish sound packets from data traffic and background noise.
3Productivity
If PLC transmissions are optimized for data communication, then communication efficiency is improved, but interference with DSL systems increases
Solution Approach 1:
The system dynamically adjusts PLC transmission parameters based on real-time interference measurements. By making transmission characteristics variable rather than fixed, the system can optimize data communication efficiency while adapting to minimize interference with DSL operations, achieving both goals simultaneously.
Solution Approach 2:
The patent changes transmission parameters such as power level, modulation scheme, and timing based on measured interference conditions. By varying these parameters dynamically, the system can maintain high communication efficiency while reducing harmful interference to DSL systems through optimized parameter selection.
4Speed
If DSL systems transmit data over twisted pair telephone lines, then high bandwidth connectivity is achieved, but signals are vulnerable to interference from nearby wireline communications
Solution Approach 1:
The system introduces an intermediary measurement and optimization layer between PLC and DSL systems. By measuring interference through sound packet detection and using this information to optimize transmissions, the intermediary mechanism protects DSL signals from PLC interference while maintaining high bandwidth connectivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient characterization and reduction of PLC signal leakage into DSL lines, improving communication efficiency and interoperability between DSL and PLC systems by accurately measuring and mitigating interference.
Implementation Method 1
detect, by a DSL receiver, impulse noise on a set of DSL lines
Implementation Method 2
PLC systems utilize electrical wiring within a building as network cables to carry communications between PLC devices
Data Source
AI summary
This disclosure provides systems, methods, and apparatus for wireline communication. A digital subscriber line (DSL) receiver may detect one or more power line communication (PLC) sound packets and measure PLC signal leakage on a set of DSL lines based on the detected sound packets. For example, PLC sound packets may be transmitted by PLC devices within a PLC network, and impulse noise received on the set of DSL lines corresponding to the transmitted PLC sound packet may be detected by a DSL receiver (such as a consumer premises equipment (CPE)). The DSL receiver may measure PLC signal leakage on the set of DSL lines based on the detected PLC sound packets. In some cases, the PLC sound packets may be detected based on a duration, a position, or an arrival time of a PLC sound packet.